1 // SPDX-License-Identifier: (GPL-2.0-only OR BSD-3-Clause)
2 //
3 // This file is provided under a dual BSD/GPLv2 license. When using or
4 // redistributing this file, you may do so under either license.
5 //
6 // Copyright(c) 2021 Advanced Micro Devices, Inc.
7 //
8 // Authors: Ajit Kumar Pandey <AjitKumar.Pandey@amd.com>
9
10 /*
11 * Generic interface for ACP audio blck PCM component
12 */
13
14 #include <linux/platform_device.h>
15 #include <linux/module.h>
16 #include <linux/err.h>
17 #include <linux/io.h>
18 #include <sound/pcm_params.h>
19 #include <sound/soc.h>
20 #include <sound/soc-dai.h>
21 #include <linux/pm_runtime.h>
22 #include <linux/dma-mapping.h>
23
24 #include "amd.h"
25
26 #define DRV_NAME "acp_i2s_dma"
27
28 static const struct snd_pcm_hardware acp_pcm_hardware_playback = {
29 .info = SNDRV_PCM_INFO_INTERLEAVED |
30 SNDRV_PCM_INFO_BLOCK_TRANSFER |
31 SNDRV_PCM_INFO_BATCH |
32 SNDRV_PCM_INFO_MMAP | SNDRV_PCM_INFO_MMAP_VALID |
33 SNDRV_PCM_INFO_PAUSE | SNDRV_PCM_INFO_RESUME,
34 .formats = SNDRV_PCM_FMTBIT_S16_LE | SNDRV_PCM_FMTBIT_S8 |
35 SNDRV_PCM_FMTBIT_U8 | SNDRV_PCM_FMTBIT_S24_LE |
36 SNDRV_PCM_FMTBIT_S32_LE,
37 .channels_min = 2,
38 .channels_max = 8,
39 .rates = SNDRV_PCM_RATE_8000_96000,
40 .rate_min = 8000,
41 .rate_max = 96000,
42 .buffer_bytes_max = PLAYBACK_MAX_NUM_PERIODS * PLAYBACK_MAX_PERIOD_SIZE,
43 .period_bytes_min = PLAYBACK_MIN_PERIOD_SIZE,
44 .period_bytes_max = PLAYBACK_MAX_PERIOD_SIZE,
45 .periods_min = PLAYBACK_MIN_NUM_PERIODS,
46 .periods_max = PLAYBACK_MAX_NUM_PERIODS,
47 };
48
49 static const struct snd_pcm_hardware acp_pcm_hardware_capture = {
50 .info = SNDRV_PCM_INFO_INTERLEAVED |
51 SNDRV_PCM_INFO_BLOCK_TRANSFER |
52 SNDRV_PCM_INFO_BATCH |
53 SNDRV_PCM_INFO_MMAP | SNDRV_PCM_INFO_MMAP_VALID |
54 SNDRV_PCM_INFO_PAUSE | SNDRV_PCM_INFO_RESUME,
55 .formats = SNDRV_PCM_FMTBIT_S16_LE | SNDRV_PCM_FMTBIT_S8 |
56 SNDRV_PCM_FMTBIT_U8 | SNDRV_PCM_FMTBIT_S24_LE |
57 SNDRV_PCM_FMTBIT_S32_LE,
58 .channels_min = 2,
59 .channels_max = 2,
60 .rates = SNDRV_PCM_RATE_8000_48000,
61 .rate_min = 8000,
62 .rate_max = 48000,
63 .buffer_bytes_max = CAPTURE_MAX_NUM_PERIODS * CAPTURE_MAX_PERIOD_SIZE,
64 .period_bytes_min = CAPTURE_MIN_PERIOD_SIZE,
65 .period_bytes_max = CAPTURE_MAX_PERIOD_SIZE,
66 .periods_min = CAPTURE_MIN_NUM_PERIODS,
67 .periods_max = CAPTURE_MAX_NUM_PERIODS,
68 };
69
acp_machine_select(struct acp_dev_data * adata)70 int acp_machine_select(struct acp_dev_data *adata)
71 {
72 struct snd_soc_acpi_mach *mach;
73 int size;
74
75 size = sizeof(*adata->machines);
76 mach = snd_soc_acpi_find_machine(adata->machines);
77 if (!mach) {
78 dev_err(adata->dev, "warning: No matching ASoC machine driver found\n");
79 return -EINVAL;
80 }
81
82 adata->mach_dev = platform_device_register_data(adata->dev, mach->drv_name,
83 PLATFORM_DEVID_NONE, mach, size);
84 if (IS_ERR(adata->mach_dev))
85 dev_warn(adata->dev, "Unable to register Machine device\n");
86
87 return 0;
88 }
89 EXPORT_SYMBOL_NS_GPL(acp_machine_select, SND_SOC_ACP_COMMON);
90
i2s_irq_handler(int irq,void * data)91 static irqreturn_t i2s_irq_handler(int irq, void *data)
92 {
93 struct acp_dev_data *adata = data;
94 struct acp_resource *rsrc = adata->rsrc;
95 struct acp_stream *stream;
96 u16 i2s_flag = 0;
97 u32 ext_intr_stat, ext_intr_stat1;
98
99 if (!adata)
100 return IRQ_NONE;
101
102 if (adata->rsrc->no_of_ctrls == 2)
103 ext_intr_stat1 = readl(ACP_EXTERNAL_INTR_STAT(adata, (rsrc->irqp_used - 1)));
104
105 ext_intr_stat = readl(ACP_EXTERNAL_INTR_STAT(adata, rsrc->irqp_used));
106
107 spin_lock(&adata->acp_lock);
108 list_for_each_entry(stream, &adata->stream_list, list) {
109 if (ext_intr_stat & stream->irq_bit) {
110 writel(stream->irq_bit,
111 ACP_EXTERNAL_INTR_STAT(adata, rsrc->irqp_used));
112 snd_pcm_period_elapsed(stream->substream);
113 i2s_flag = 1;
114 }
115 if (adata->rsrc->no_of_ctrls == 2) {
116 if (ext_intr_stat1 & stream->irq_bit) {
117 writel(stream->irq_bit, ACP_EXTERNAL_INTR_STAT(adata,
118 (rsrc->irqp_used - 1)));
119 snd_pcm_period_elapsed(stream->substream);
120 i2s_flag = 1;
121 }
122 }
123 }
124 spin_unlock(&adata->acp_lock);
125 if (i2s_flag)
126 return IRQ_HANDLED;
127
128 return IRQ_NONE;
129 }
130
config_pte_for_stream(struct acp_dev_data * adata,struct acp_stream * stream)131 static void config_pte_for_stream(struct acp_dev_data *adata, struct acp_stream *stream)
132 {
133 struct acp_resource *rsrc = adata->rsrc;
134 u32 pte_reg, pte_size, reg_val;
135
136 /* Use ATU base Group5 */
137 pte_reg = ACPAXI2AXI_ATU_BASE_ADDR_GRP_5;
138 pte_size = ACPAXI2AXI_ATU_PAGE_SIZE_GRP_5;
139 stream->reg_offset = 0x02000000;
140
141 /* Group Enable */
142 reg_val = rsrc->sram_pte_offset;
143 writel(reg_val | BIT(31), adata->acp_base + pte_reg);
144 writel(PAGE_SIZE_4K_ENABLE, adata->acp_base + pte_size);
145 writel(0x01, adata->acp_base + ACPAXI2AXI_ATU_CTRL);
146 }
147
config_acp_dma(struct acp_dev_data * adata,struct acp_stream * stream,int size)148 static void config_acp_dma(struct acp_dev_data *adata, struct acp_stream *stream, int size)
149 {
150 struct snd_pcm_substream *substream = stream->substream;
151 struct acp_resource *rsrc = adata->rsrc;
152 dma_addr_t addr = substream->dma_buffer.addr;
153 int num_pages = (PAGE_ALIGN(size) >> PAGE_SHIFT);
154 u32 low, high, val;
155 u16 page_idx;
156
157 val = stream->pte_offset;
158
159 for (page_idx = 0; page_idx < num_pages; page_idx++) {
160 /* Load the low address of page int ACP SRAM through SRBM */
161 low = lower_32_bits(addr);
162 high = upper_32_bits(addr);
163 writel(low, adata->acp_base + rsrc->scratch_reg_offset + val);
164 high |= BIT(31);
165 writel(high, adata->acp_base + rsrc->scratch_reg_offset + val + 4);
166
167 /* Move to next physically contiguous page */
168 val += 8;
169 addr += PAGE_SIZE;
170 }
171 }
172
acp_dma_open(struct snd_soc_component * component,struct snd_pcm_substream * substream)173 static int acp_dma_open(struct snd_soc_component *component, struct snd_pcm_substream *substream)
174 {
175 struct snd_pcm_runtime *runtime = substream->runtime;
176 struct device *dev = component->dev;
177 struct acp_dev_data *adata = dev_get_drvdata(dev);
178 struct acp_stream *stream;
179 int ret;
180
181 stream = kzalloc(sizeof(*stream), GFP_KERNEL);
182 if (!stream)
183 return -ENOMEM;
184
185 stream->substream = substream;
186
187 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
188 runtime->hw = acp_pcm_hardware_playback;
189 else
190 runtime->hw = acp_pcm_hardware_capture;
191
192 ret = snd_pcm_hw_constraint_integer(runtime, SNDRV_PCM_HW_PARAM_PERIODS);
193 if (ret < 0) {
194 dev_err(component->dev, "set integer constraint failed\n");
195 kfree(stream);
196 return ret;
197 }
198 runtime->private_data = stream;
199
200 writel(1, ACP_EXTERNAL_INTR_ENB(adata));
201
202 spin_lock_irq(&adata->acp_lock);
203 list_add_tail(&stream->list, &adata->stream_list);
204 spin_unlock_irq(&adata->acp_lock);
205
206 return ret;
207 }
208
acp_dma_hw_params(struct snd_soc_component * component,struct snd_pcm_substream * substream,struct snd_pcm_hw_params * params)209 static int acp_dma_hw_params(struct snd_soc_component *component,
210 struct snd_pcm_substream *substream,
211 struct snd_pcm_hw_params *params)
212 {
213 struct acp_dev_data *adata = snd_soc_component_get_drvdata(component);
214 struct acp_stream *stream = substream->runtime->private_data;
215 u64 size = params_buffer_bytes(params);
216
217 /* Configure ACP DMA block with params */
218 config_pte_for_stream(adata, stream);
219 config_acp_dma(adata, stream, size);
220
221 return 0;
222 }
223
acp_dma_pointer(struct snd_soc_component * component,struct snd_pcm_substream * substream)224 static snd_pcm_uframes_t acp_dma_pointer(struct snd_soc_component *component,
225 struct snd_pcm_substream *substream)
226 {
227 struct device *dev = component->dev;
228 struct acp_dev_data *adata = dev_get_drvdata(dev);
229 struct acp_stream *stream = substream->runtime->private_data;
230 u32 pos, buffersize;
231 u64 bytescount;
232
233 buffersize = frames_to_bytes(substream->runtime,
234 substream->runtime->buffer_size);
235
236 bytescount = acp_get_byte_count(adata, stream->dai_id, substream->stream);
237
238 if (bytescount > stream->bytescount)
239 bytescount -= stream->bytescount;
240
241 pos = do_div(bytescount, buffersize);
242
243 return bytes_to_frames(substream->runtime, pos);
244 }
245
acp_dma_new(struct snd_soc_component * component,struct snd_soc_pcm_runtime * rtd)246 static int acp_dma_new(struct snd_soc_component *component,
247 struct snd_soc_pcm_runtime *rtd)
248 {
249 struct device *parent = component->dev->parent;
250
251 snd_pcm_set_managed_buffer_all(rtd->pcm, SNDRV_DMA_TYPE_DEV,
252 parent, MIN_BUFFER, MAX_BUFFER);
253 return 0;
254 }
255
acp_dma_close(struct snd_soc_component * component,struct snd_pcm_substream * substream)256 static int acp_dma_close(struct snd_soc_component *component,
257 struct snd_pcm_substream *substream)
258 {
259 struct device *dev = component->dev;
260 struct acp_dev_data *adata = dev_get_drvdata(dev);
261 struct acp_stream *stream = substream->runtime->private_data;
262
263 /* Remove entry from list */
264 spin_lock_irq(&adata->acp_lock);
265 list_del(&stream->list);
266 spin_unlock_irq(&adata->acp_lock);
267 kfree(stream);
268
269 return 0;
270 }
271
272 static const struct snd_soc_component_driver acp_pcm_component = {
273 .name = DRV_NAME,
274 .open = acp_dma_open,
275 .close = acp_dma_close,
276 .hw_params = acp_dma_hw_params,
277 .pointer = acp_dma_pointer,
278 .pcm_construct = acp_dma_new,
279 .legacy_dai_naming = 1,
280 };
281
acp_platform_register(struct device * dev)282 int acp_platform_register(struct device *dev)
283 {
284 struct acp_dev_data *adata = dev_get_drvdata(dev);
285 struct snd_soc_dai_driver;
286 unsigned int status;
287
288 status = devm_request_irq(dev, adata->i2s_irq, i2s_irq_handler,
289 IRQF_SHARED, "ACP_I2S_IRQ", adata);
290 if (status) {
291 dev_err(dev, "ACP I2S IRQ request failed\n");
292 return status;
293 }
294
295 status = devm_snd_soc_register_component(dev, &acp_pcm_component,
296 adata->dai_driver,
297 adata->num_dai);
298 if (status) {
299 dev_err(dev, "Fail to register acp i2s component\n");
300 return status;
301 }
302
303 INIT_LIST_HEAD(&adata->stream_list);
304 spin_lock_init(&adata->acp_lock);
305
306 return 0;
307 }
308 EXPORT_SYMBOL_NS_GPL(acp_platform_register, SND_SOC_ACP_COMMON);
309
acp_platform_unregister(struct device * dev)310 int acp_platform_unregister(struct device *dev)
311 {
312 struct acp_dev_data *adata = dev_get_drvdata(dev);
313
314 if (adata->mach_dev)
315 platform_device_unregister(adata->mach_dev);
316 return 0;
317 }
318 EXPORT_SYMBOL_NS_GPL(acp_platform_unregister, SND_SOC_ACP_COMMON);
319
320 MODULE_DESCRIPTION("AMD ACP PCM Driver");
321 MODULE_LICENSE("Dual BSD/GPL");
322 MODULE_ALIAS(DRV_NAME);
323